.login-box {
    width: 400px;
    height: 300px;
    border: 2px solid black;
    margin: 0 auto;
    position: fixed;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;

    button {
        position: absolute;
        top: 70%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
}